CO2 Non Blowback Pistols. Take your pick: there's a variety out there.
CO2 is efficient because:
1. It's cheap. Unlike green gas that is usually bought online, not through your local sporting goods store.
2. It's powerful. You will get more shots per CO2 cartridge than one fill up of green gas.
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That's a very vague question. If you are looking for cheap gun look up WE. They are a cheap professional brand. Otherwise, KWA or Tokyo Marui will be the Ferrari brands of Airsoft.